package com.sky.service.impl;

import com.alibaba.fastjson.JSONObject;
import com.sky.constant.JwtClaimsConstant;
import com.sky.constant.MessageConstant;
import com.sky.dto.UserLoginDTO;
import com.sky.entity.User;
import com.sky.exception.LoginFailedException;
import com.sky.mapper.UserMapper;
import com.sky.properties.JwtProperties;
import com.sky.properties.WeChatProperties;
import com.sky.service.UserService;
import com.sky.utils.HttpClientUtil;
import com.sky.utils.JwtUtil;
import com.sky.vo.UserLoginVO;
import lombok.extern.slf4j.Slf4j;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.stereotype.Service;

import java.time.LocalDateTime;
import java.util.HashMap;
import java.util.Map;

/**
 * C端用户相关接口
 *
 * @author Moozy 2025/4/17 0:59
 **/
@Slf4j
@Service
public class UserServiceImpl implements UserService {

    // 微信服务接口地址
    public static final String WX_LOGIN = "https://api.weixin.qq.com/sns/jscode2session";

    @Autowired
    private WeChatProperties weChatProperties;

    @Autowired
    private JwtProperties jwtProperties;

    @Autowired
    private UserMapper userMapper;

    @Override
    public UserLoginVO wxLogin(UserLoginDTO userLoginDTO) {
        // 调用微信接口服务，获得当前用户 openid
        String openId = getOpenId(userLoginDTO);

        // 如果 openid 为空，登录失败
        if (openId == null) {
            throw new LoginFailedException(MessageConstant.LOGIN_FAILED);
        }

        // 判断当前用户是否为新用户
        User user = userMapper.getByOpenId(openId);

        // 如果是新用户，完成注册
        if (user == null) {
            user = User.builder()
                    .openid(openId)
                    .createTime(LocalDateTime.now())
                    .build();
            userMapper.insert(user);
        }

        // 生成 JWT 令牌
        Map<String, Object> claims = new HashMap<>();
        claims.put(JwtClaimsConstant.USER_ID, user.getId());
        String token = JwtUtil.createJWT(jwtProperties.getUserSecretKey(),
                jwtProperties.getUserTtl(),
                claims);

        return UserLoginVO.builder()
                .id(user.getId())
                .openid(user.getOpenid())
                .token(token)
                .build();
    }

    private String getOpenId(UserLoginDTO userLoginDTO) {
        // 调用微信接口服务，获得当前用户 openid
        Map<String, String> map = new HashMap<>();
        map.put("appid", weChatProperties.getAppid());
        map.put("secret", weChatProperties.getSecret());
        map.put("js_code", userLoginDTO.getCode());
        map.put("grant_type", "authorization_code");

        String json =  HttpClientUtil.doGet(WX_LOGIN, map);
        JSONObject jsonObject = JSONObject.parseObject(json);

        return jsonObject.getString("openid");
    }
}
